The grouted mortise-tenon joint, invented as the connection between the large prefabricated components, is the key to the prefabricated underground structures, and the double-tenon joint is most widely used in the prefabricated metro station structure. This paper conducts characteristic analysis of bending stiffness with a 1 : 1 prototype test in key working direction of different joint types for grouted double mortise-tenon joint. The results show that the double-tenon joint is characteristic of variable stiffness under different loads. Change laws of double-tenon joint bending stiffness without and with auxiliary pretightening device in tension side and compression side are also discussed. The correlations for calculating double-tenon joint bending stiffness with various axial loads and bending moments are derived at last, which offers the theory foreshadowing of similar joints.

中文翻译：

---

装配式地铁车站结构灌浆双榫头抗弯刚度特性试验分析

灌浆榫卯作为大型预制构件之间的连接而发明，是地下预制结构的关键，双榫在预制地铁车站结构中应用最为广泛。本文采用1:1原型试验对灌浆双榫接头不同接头类型的关键工作方向进行弯曲刚度特性分析。结果表明，双榫接头在不同载荷作用下具有变刚度特性。还讨论了无和有辅助预紧装置在受拉侧和受压侧双榫接头弯曲刚度的变化规律。最后推导了计算双榫节点在不同轴向载荷和弯矩下的抗弯刚度的关系式，